Boring-machine.



No. 779,931. PATENTED JAN. 10, 1905. W. HARKER & A. T. ALLOGGK.

7 SHEETS-SHEET 2.

No. 779,931, 'PATENTED JAN. 10, 1905. W. HARKER & A. T. ALLOOCK. BORINGMACHINE.

APPLICATION FILED MAY 25, 1903.

7 SHEETS-SHEET 3.

FIG: 3.

No 779,931. PATENTED JAN. 10, 1905. W. HARKER & A. T. ALLGOGK.

BORING MACHINE.

APPLIOATIOH FILED MAY 25, 1903.

7 SEEETS-SHEET 4.

F I s 4 GT3"! nnnnunnn 4 EWIHIUHHIHIHIHIH w l n N0. 779,981. PATENTEDJAN. 10 1905. W. HARKBR & A, T. ALLGOOK.

BORING MACHINE. APPLICATION FILED HAY zsj 1903.

'! SEEETS-SHEBT 5.

mm 1I2HII mm No. 779,931; PATENTED JAN.10, 1905.

' W. HARKER & A. T. ALLOOCK.

BORING MACHINE.

APPLIOATION FILED MAY 25, 1903.

7 SHEETS-SHEET 6.

No. 779,981. PATENTED JAN. 10, 1905. W. HARKER & A. T. ALLOOGK. BORINGMACHINE.

APPLICATION FILED MAY 25, 1903.

7 SHEETS-SHEET 7.

Jamie 2 0/5; lflal'azwjiaiier 6M717 (/flkoci.

J. v.%v mm\l\ m ogggz :==xx gggg 06 M. J m/ x Z UNITED STATES PatentedJanuary 10, 1905.

PATENT OFFICE,

N EWARK-ON-TREN T, ENGLAND.

BORING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 779,931, dated January10, 1905.

Application filed May 25, 1903. Serial No. 158,742.

To all whom it may concern.-

Be it known that weJVILLIAM HARKER, re-

siding at Cannon Street House, London, and

ARTHUR THoMAs ALLcocK, residing at Spring Gardens, Newark-on-Trent, inthe county of Nottingham, England, subjects of the King of GreatBritain,have invented certain new and useful Improvements in Boring-Machines, ofwhich the following is a specification.

Our invention relates to that class of boring-machines in which the feedmotion to the boring-bar is derived from a screw (which forms a portionof or is acontinuation of the boring-bar) and a nut encircling the screwand capable of being revolved in a fixed bearing, the amount of feed andits direction depending upon the difierence in the velocity of the screwand its nut. As hitherto constructed the varying velocity between thescrew and its nut has been obtained by means of a'counter-shaft drivenby the screw with a pair of toothed wheels and giving motion to the nutby means of a second pair of toothed wheels having a different number ofteeth to the drivers, so requiring change-wheels for each difierentvelocity that may be required.

The object of our invention is to provide a feed mechanism which willobviate the necessity of change-wheels and enable the velocity of thenut, and consequently the amount of the feed,to be variedand moreprecisely regulated, as required.

In the accompanying drawings, Figures 1, 2, and 3 are respectively frontelevation, (partly in section,) side elevation, and sectional plan of animproved boring-machine. Figs. 1 and 5 are respectively side elevationand under side plan of mechanism for reversing the feed of the mainscrew. Fig. 6 is a side elevation of a modification, and Figs. 7 and 8are respectively front elevation and vertical section of anothermodification.

the ratio of the gear 2 to the gear 1.

capable of rotation in a fixed bearing 4. Between these two bevel-wheelsis a spur-wheel E, running loose upon the counter-shaft B and providedwith two or more bevel-wheels Gr, revolving upon axles 5, attached tothe spurwheel E. These bevel-Wheels are in gear with both the fast andloose bevel-wheels O and D upon the counter-shaft and form abalancegear. The spur-wheel E of the balance-gear engages with a similarwheel H, attached to the feed-nutI of the screw A. The ratio of the gearH to the gears O E G is the same gs T e result of this combination isthat when the lower bevel-wheel D, which is loose upon the counter-shaftB, is held stationary the feednut I and its spur-wheel H will be drivenby the balance-gear at the same velocity and in the same direction asthe screw A, and no feed or longitudinal motion will ensue. When thelower bevel-wheel D is left free to revolve, no motion will betransmitted by the balancegear to the nut I and its spur-wheel H, and

the screw will move up or down in the nut according to the direction ofits revolutions. When the lower bevel-wheel D is rotated, the motiongiven to .it will be communicated by the balance-gear to the nut I andits spurwheel H in proportion to the speed and direction of suchrotation, so that a positive or a negative feed will be given to thescrew A.

In diamond-boring and other like machines Where the frame K, carryingthe boring-bar screw, is so constructed, as shown in Figs. 1, 2, and 3,that it may be set to bore at varying angles and also where theboring-rod screw is carried in a swinging frame, so that it may be swungclear of the bore-holes, it is necessary that the whole of the feedmechanism should be fixed to the frame K, so as to be capable of movingwith the actuating or boring rod screw A and its frame K when set at anangle or swung open. For this purpose we construct the feed-gear asabove described, and on the boss of the lower (loose) bevelwheel D weattach a ratchet-wheel J, furnished with a pawl 6, pivoted to the frameK, so that when the pawl 6 is in position the ratchet-wheel J and itsbevel-wheel D are held stationary and prevented from revolving in onedirection with the rest of the balance-gear. In that position thefeed-nut I will rotate at the same speed and in the same direction asthe screw, and no longitudinal motion or feed will be given it. Onreleasing the pawl 6 the ratchet-wheel J and its bevel-wheel D will befree to revolve with the balance-gear and transmit no motion to the nutI. The revolving screw will then work in the stationary nut and bewithdrawn from the borehole. To give a variable automatic feed, we fixin bearings on the frame K a second small counter-shaft L. This shaftcarries an arm 7, Fig. 3, bearing, with a pressure obtained from aspring 8, upon a cam or cams 9, attached to or formed upon a sleeverotating with the boring-bar screw A. This gives an oscillating motionto the shaft L, the oscillations varying according to the number anddepth of the lobes upon the cam with which its arm is in contact. Uponthe lower end of the shaft L we fix a second arm M, upon which ismounted a sliding block 10, which can be moved to and from the center ofoscillation by means of a screw 11, furnished with a handle orhand-wheel 12, and a sliding nut 13, connected to the slider 10 by alink 14. A connecting-rod couples the slider 10 with a radius-bar 16,working loose on the axis of the ratchet-wheel J. A pawl 17 on theradiusbar 16 engages with the ratchet-wheel J, and so communicates themotion of the slider 10 to it in one direction, the amount of suchmotion and the feed being regulated by the handle 12 and its screw 11.

' In the arrangement shown on Figs. 1, 2, and 3 there are two methods ofstopping the feed via, one by screwing in the slider 10 until itcoincides with the center of oscillation of the arm M and another bythrowing the pawl 17 out of gear with the ratchet-wheel J. When the feedis to be reversed and feed-screw A Withdrawn, both pawls 6 and 17 haveto be disengaged from the ratchet-wheel J. A method of doing thisinstantaneously and by one operation is shown on Figs. 4 and 5. For thispurpose we pivot a circular plate N on the axis of the ratchet-wheel J.This plate is made of larger diameter than the ratchet-wheel J, coveringits teeth and preventing the pawls 6 and 17 from falling into gear whenthe plate is in one position. Spaces or gaps 18 are cut in the plate Nto allow the pawls to work when in another position, which is the normalone. WVhen the feed is on, as shown in Figs. 1 and 5, a link 19 and arm20 connect the plate to the hand-lever 21, so that it can be turned onits axis and both pawls thrown out of gear by a partial revolution ofthe hand' lever 21 round its axis. The hand-lever 21 has a projectionadapted to engage notches to hold same in position when adjusted and mayalso be provided with a pawl or brake 22, so that should the friction ofthe screw carry the nut round with it when the pawls 6 and 17 arereleased by the hand-lever 21 a further motion of the hand-lever willbring the pawl or brake 22 in contact with the loose wheel E of thebalance-gear and arrest its motion.

Fig. 6 shows a modification of the feed arrangement as above described.Instead of the ratchet-wheel J We fix in or on the boss 3 of the lowerbevel-wheel D a worm-wheel O, driven by a worm 23, actuated by a handle24, so that the lower bevel-wheel D of the balance-gear may be rotatedby hand in either direction and a positive or negative feed given to theboring-bar screw A. A belt speed-cone 25 may be mounted on thedriving-shaft of the worm 23 and driven by the speed-cone 26, fixed on ashaft carried in bearings on the frame of the machine and driven byother speed-cones 27 and 28 from the main driving shaft of the machine.By changing the belts on the steps of the cones various speeds may begiven to the worm-wheel O and the rate of feed altered. When aworm-wheel O is used in the place of the ratchet-wheel J, it cannot bereadily disengaged from its worm 23 to allow the feed-nut to remainstationary and the screw A to ascend. We therefore provide the upperbevel-wheel C with a clutch P, by means of which it may be disconnectedby the lever 29 from its driving-shaft B, so that no motion will begiven by it to the balance-gear and nut.

Figs. 7 and 8 show an arrangement by which the balance-gear instead ofbeing carried on a shaft parallel to the boring-bar screw is coaxialwith it and supported on a sleeve R, surrounding the screw A. The'sleeveR revolves with the screw A, but is longitudinally immovable, as will beunderstood. The upper bevel-wheel (J of the balance-gear is loose uponthe sleeve R and is driven in a reverse direction to the screw A by themain driving-pinion S, being furnished with an upper set of teeth forthat purpose. The spur-wheel E, also loose upon the sleeve R, carriesthe intermediate bevel-wheels G, revolving upon the axles 5, attached tothe spurwheel E. The bevel-wheels G gear with the lower bevel-wheel D,which is made in one piece with or attached to the feed-nut I, and thewheels G also gear with the upper bevelwheel C and form a balance gearsimilar in its action to that described above. The result of thiscombination is that when the spur-wheel E is held stationary the upperbevelwheel 0, acting through the bevel-wheels G, drives the lowerbevel-wheel D and the nut I in the same direction and at the samevelocity as the feed-screw A, and no longitudinal motion ensues. If thespur-wheel E is allowed to revolve, no motion will be transmitted to thelower bevel-wheel D and nut I, and the screw A will consequently ascendthrough the stationary nut I. When the spur-wheel E is revolved in thesame direction as the screw,

its motion will be communicated through the bevel-wheels G to the lowerbevel-wheel D and the nut I and its motion accelerated, causing thescrew A to feed downward in proportion to the difference of the speedsbetween the nut and the screw. Various methods may be employed toactuate the spurwheel E, one of which is shown in Figs. 7 and 8. Gearingwith the spur-wheel E is a pinion T, which can be connected to ordisconnected from the worm-wheel U by the clutch 30. The worm 31actuates the wormwheel and may be driven by the handle 32 or byspeed-cones in a similar manner to that shown in Fig. 6. The clutch 30allows the pinion T to be disconnected from the wormwheel U and revolvewith its wheel E when the feed-screw A is to be raised or withdrawn. Thespur-wheel E may also be formed as a ratchet-wheel and receive itsmotion and be released in a similar manner to that described in Figs. 1,2, 3, 4, and 5.

We claim 1. In a boring-machine, the combination with a screw-shaftboring-bar and a countershaft geared therewith, of an upper bevelwheelfixed to said counter-shaft, a lower bevel-wheel loose upon saidcounter-shaft, a spur-wheel loose upon said counter-shaft, a pluralityof bevel-pinions carried by said spur-wheel and mounted between saidbevelwheels, a nut mounted upon said bar, a spurwheel carried by saidnut and engaging with the spur-wheel upon the counter-shaft, and meansadapted to control the rotary motion of said lower bevel-wheel, therebycontrolling the operation of the spur-wheel carried by the nut andvarying the feed and effecting a rapid reversal of said boring-bar.

2. In a boring-machine, the combination with a screw-shaft boring-bar,anut mounted thereon, a balance-gear engaging with the nut for operating1t, and means for controlling the operation ofthe gear for imparting avariable automatic feed of said bar, said meansconsisting of avertically-disposed rock-shaft, an arm clenched to said rock-shaft, aslider adapted to be adjusted in guides on said arm, a screw-threadedshaft, a nut upon said screwthreaded shaft, a link connecting the sliderwith said nut, a connecting-rod pivoted to said slider and to saidcontrolling means for the balance-gear, means for rotating saidscrewthreaded shaft, and means for reciprocating said rock-shaft.

3. In a boring-machine, the combination of a rotatable screw-shaftboring-bar, a countershaft, an operative connection between saidrotatable bar and said shaft, causing thereby the operation of saidcounter-shaft, a revoluble nut carried by said bar, a balance-gearcarried by said counter-shaft, and an operative connection between saidgear and said nut, causing thereby a suitable operation of the nut whenthe gear is operated.

4. In a boring-machine, the combination of a rotatable screw-shaftboring-bar, a revoluble nut mounted thereon, a spur-wheel carried bysaid nut and adapted when operated to impart movement to the nut, abalancegear comprising in' its construction a loose gear, a spur-wheelcarried by the balancegear and adapted to engage with the spur-wheel ofthe nut for operating it, means for fixing said loose gear, and anoperative connection between the boring-bar and said balance-gear.

Dated this 8th day of May, 1903. WVILLIAM HARKER. ARTHUR THOMAS ALLCOCK.WVitnesses:

IVALTER J. SKERTEN, Gno. M. FRANKLIN.

